Nature of Business and Summary of Significant Accounting Policies (Narrative) (Detail) - USD ($)	3 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Significant Accounting Policies [Line Items]
Carrying amount of long-term debt, including current portion	$ 9,300,000		$ 10,700,000
Short-term time deposits	460,000		$ 460,000
Intangible assets amortization expense	137,000	$ 166,000
Estimated amortization expense-2016	529,000
Estimated amortization expense-2017	441,000
Estimated amortization expense-2018	371,000
Estimated amortization expense-2019	313,000
Estimated amortization expense-2020	$ 264,000
Weighted average amortization period for acquired intangible assets	12 years 10 months 24 days	13 years 8 months 12 days
Antidilutive options outstanding excluded from diluted EPS computations	170,000	145,500
Stock-based compensation costs	$ 32,000	$ 33,000
Sales Returns And Allowances Percentage	7.00%	8.00%
Stock-based compensation costs, effect on EPS	$ 0.00	$ 0.00
Selling, General and Administrative Expenses [Member]
Significant Accounting Policies [Line Items]
Advertising and promotion costs	$ 558,000	$ 544,000
Sales revenue, net [Member]
Significant Accounting Policies [Line Items]
Shipping and handling revenue	216,000	241,000
Cost of sales [Member]
Significant Accounting Policies [Line Items]
Research and development costs	1,489,000	1,311,000
Shipping and handling expense	131,000	$ 127,000
Allowance for doubtful accounts current [Member]
Significant Accounting Policies [Line Items]
Valuation allowances and reserves, balance	100,000			$ 175,000
Returns and other allowances [Member]
Significant Accounting Policies [Line Items]
Valuation allowances and reserves, balance	$ 930,000			$ 1,260,000